Pollen analytical studies on the Asoda Peat Bed in the foot area of the Myoko Volcano, Central Japan

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  • 妙高火山山麓の麻苧田(あそだ)泥炭層の花粉分析
  • 妙高火山山麓の麻苧田泥炭層の花粉分析
  • ミョウコウ カザン サンロク ノ アサオデン デイタンソウ ノ カフン ブンセキ

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Abstract

As a result of the pollen analytical study on the Asoda Peat Bed presumed that accumulated in the age from 20.200 ± 800 Y.B.P. to 17.900±450 Y.B.P. in the foot area of the Myoko Volcano, we have come to conclude as follows: 1) Abies and Pinus dominate and Tsuga, Picea, Betula, Alnus, Quercus etc. subdominate in the assemblage of the pollen grains contained inside the peat bed. 2) It may be supposed that the main origin of the pollen grains was the forest that developed on the hills surrounding the spot where the peat bed was accumulated. 3) It may be estimated that the flora in that place at that time restored to the original state from the pollen assemblage was similar to the present subalpine forest. 4) It may be deduced that the maximum lowering of the subalpine coniferous forest zone here had come to 1,900 m or thereabout in the sea level at the time, and that the maximum deterioration of the climate in annual temperature here had come to 9.5℃ or thereabout then.

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